Export necessary types from jest-runner

[Mark1626]

Summary

The following type are required to be exported from jest-runner, so that they can be imported when writing a runner in Typescript

Type signature of runTests

async runTests(
  tests: Array<Test>,
  watcher: TestWatcher,
  onStart: OnTestStart,
  onResult: OnTestSuccess,
  onFailure: OnTestFailure,
  options: TestRunnerOptions,
): Promise<void>

Types needed to be exported

OnTestFailure
OnTestStart
OnTestSuccess
TestWatcher 
TestRunnerContext 
TestRunnerOptions

Needed for #8810

/cc @SimenB

Test plan

The existing test cases should cover it, will be adding a test using the types when raising a PR for
#8810

[SimenB]

Mind updating the changelog?

[Mark1626]

Done

[github-actions]

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